Compilare: user.cpp: In function ‘void read()’: user.cpp:133:23: warning: narrowing conversion of ‘x’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] W[y].pb({x, c}); ^ user.cpp: In function ‘void dfs(int)’: user.cpp:140:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < W[x].size(); ++ i) ^ user.cpp: In function ‘void update(int)’: user.cpp:152:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < W[x].size(); ++ i) ^ user.cpp: In function ‘void solve()’: user.cpp:172:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < T[i].size(); ++ j) ^ user.cpp: In function ‘void read()’: user.cpp:112:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &B); ^ user.cpp:117:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd%hd%d%d%d", &a, &b, &c, &p, &s); ^